C.M. Brown, L. Cristofolini, et al.
Chemistry of Materials
We agree that our simulations of the two-dimensional quantum XY model differ from those of De Raedt and Lagendijk and argure that our results a finite specific-heat peak and a conclusively nonzero vortex density at zero temperature are the correct ones, agreeing with other work on this model. © 1986 The American Physical Society.